Filter



Feb. 5, 1952 H. E. MARVEL Y 2,584,394

- FILTER I Filed Jan. 26, 1946 2 SHEETS-SHEET 1 HARVEY E. MARVEL 3 INVENTOR.

BY WC H H- E. ARVEL Feb. 5, 1952 FILTER 2 SHEETS-SHEET 2 Filed Jan. 26, 1946 HARVEY EMHRVEL INVENTOR.

Patented Feb. 5, 1952 FILTER Harvey E. Marvel, Fort Wayne, 11111., assignor. to

. Bowser, Inc., Fort.Wayne,-.Ind.', a corporation of Indiana Application January 26, 1946, Serial No. 643,565

This invention relates to a filter having backwashing filter elements adapted to support a precoat of filter powder, more specifically, it relates to a filter having elementsthat are adapted to support a precoat-to catch and retain foreign matter and which can be washed ofi the elements by reversing the flow of liquid through the elements.

It is an object of this invention; to provide a filter having provisions to backwash the elements.

It is another object of this invention to provide a filter having elements that are easy and economical to replace.

It is still another object of this invention to provide an elfective seal between the inlet and discharge sides of the elements.

It is yet another object of this invention to provide bafile means on the inlet side of the filter to distribute the flow of liquid evenly to the elements and without direct impingement.

It is still another object of this inventionto provide a filter in which it is simple and easy to introduce a filter aid.

These and other objects will become apparent from a study of this specification and'the drawings which are attached hereto and made a part hereof and in which:

Figure 1 is a vertical section of the filter and piping, taken on line l--l oflFigure 2, showing the filter elements, the powder feed mechanism and the backwashin means.

Figure 2 is an elevation taken from the inlet side, which is the right side as viewed in Figure 1, showing the top portion of the filter.

Figure 3 is a view, partly in plan and partly in section, of the filter head, the section having been taken substantially on the line 33 of Figure 2.

Figure 4 is a detail of the baffle as viewed from the top.

Figure 5 is a section taken on the line 5-5 of Figure 1, showing one of the projections on the baffle and the holding recess therefor.

Referring now to Figure 1 of the drawings, the filter body I is substantially an open topped cylinder with cone bottom 3 terminating in a chamber 5 having bosses l and 9 Whichhave tapped holes H and I3. Two diametrically Opposed pockets (Figure 5) are formed in projections 1 Claim. (Cl. 2109-184) 2 I H which extend in from the cone near the chamberi. An external flange l9 and an internal flange 2| extend around the top of the body, the internal flange having an opening 23. Bosses 25 (Figure 2) areprovided for tapped holes-which receive cap screws 31.

A bafile 21 has a spherical cap portion 29 and two diametrically opposed tabs 3! which are formed to enter the pockets l5. The bafiie is preformed with the tabs bent downwardly at an angle from the horizontal, in which position they willclearthe upper edges of the pockets,

but not the lower. The bafile is then pressed downwardly to bend the tabs into the horizontal position sothatthey will engage in pockets and will be held thereby.

A resilient gasket 33, circular in shape, is provided to seat on the top of flanges I9 and 2! of the filter body and to provide a seal between the bodyanda flange 36 around the periphery of the head 'onits bottom side. Cap screws 37 fasten the head to the body and compress the gasket.

Equally spaced about the axis of the head are four'sealing rings 39 which are formed in the bottom face of the head. The sealing rings are comprised of an inner ring 4| and an outer ring 43='with an annular V section 45 located midway between the inner and outer rings, forming an inwardly. tapering circular channel 41 with the V, rib inits middle facing downwardly. The appearance is similar to that of .a capital M.

Semi-circular ports 49 are disposed between each sealing ring and its central axis and communicate with. a circular passage 5|. Ribs 6i and bosses. 63 assist in defining the ports, and the bosses are provided with tapped holes 65, for the reception of tie rods, as will be explained. The passage El connects with passages 53 and 55, which communicate with theexterior by way of tapped holes 51 and 59. .A-chamber 67 is formed centrally in the head 35 and-has an outlet fi at the bottom opening into the body I and a second opening "H at the top which is-circular in shape and has a radially directed flange 73 surrounded by an annularrim 15; A circular'gasket 17 is received on the flange and "provides a seal between it and the cap 79. The cap is crowned slightlyand has a central, upwardly-extending boss 8| projecting from the top. The boss has a spherical depression 83 which receives the rounded lower end of a clamping screw 35 which carries threads 81 on its lower end. The screw is provided with a handle 8d.

A yoke 9| has a tapped hole 33 engaging the thread of the screw and has two diametrically opposed. legs 35 extending outwardly and downwardly; and each leg is provided with a finger 9? extending inwardly and under projections 99 cast on opposite sides of the head. A stop IllI for the yoke is provided on the under side of each projection.

A nipple I03 enters tapped hole 51 and connects with a three-way valve I which is connected to an unfiltered water supply conduit I01 A conduit I09, a union III, and a bent conduit I I3 connect the valve with the tapped hole II at the bottom of the filter body.

Hollow, cylindrical filter elements I2I have their top ends I23 seated in the sealing rings 39 and their lower ends I25 seated in circular cuplike retainers I21 having a cross-section very similar to that of the sealing rings. wall I3I of the retainer extends upward and inclines toward the center, an outer wall I33 extends upward and inclines away from the center, and a V-shaped projection I29 is disposed between the walls. A hole I35 in each of the retainers provides passage for a tie rod I31 which is threaded at both ends. The top threads I39 engage threads 65 in boss 63 and the lower threads MI are engaged by acorn nuts I43. Washer M5 is inserted between the bottom of the retainer and the face of the acorn nut to provide added strength for the retainer.

The acorn nut is drawn up on threads I4I to force the V sections 45 and I29 into the ends of the elements IZI, the side walls of the channel 41 and the walls I3I and I33 of the retainer press inwardly upon the element and assist in forming a seal. The cartridge is thus deformed somewhat on both ends in order to prevent leakage around it.

A waste conduit I15 and a gate valve I" are connected to tapped hole I3 in boss 9, while the filtrate discharge conduit H9 is in communication with chamber 55 by way of hole '59.

The filter elements I2I may, of course, be of any suitable design so long as they will support a precoat of diatomaceous earth or other filter aid. I have found that a spirally wound tube made of phenolic resin impregnated paper which is baked ,after forming is very acceptable and holds a precoat very well. Further, such elements lend themselves very readily to the method of support in the tank as disclosed herein.

Operation When starting the filter in operation, the cap '59 is removed after unscrewing the screw 85 sufficiently to loosen and permit removal of the yoke SI by a slight counter-clockwise rotation (Figure 3). A measured quantity of filter aid is deposited into the chamber 61 and drops into the bowl I, the bulk of the filter aid resting on the bafile 27. The filter is then filled with liquid, the water flowing from conduit IO'I throughthe three-way valve I05, conduits I09 and H3 into chamber 5. Valve II! and all valves on conduit H9 are closed. Conduit II9 is a service line. The liquid rises past the bafile, evacuating the air in the filter through the opening II in the head. When substantially all the air is evacuated, the

An inner.

deflects the incoming liquid to prevent direct impingement of the stream on the elements to prevent the erosion of the filter aid from the elements. The liquid passes through the elements I2I and int passage 5I by way of ports Q9. The liquid is discharged from passage 5| by way of chamber and the service conduit I I9, the flow being responsive to the opening and closing of the service valves.

After the precoat is established, the filtration is continued and the.foreign matter in the liquid will be extracted by the filter aid in the usual manner until such time as the fiow rate of the filtrate drops below a desired minimum. The elements I2I are then backwashed in the following manner: Close the service valves, open valve I I? and turn the three-way cock I to close conduit I09 and direct the flow of incoming liquid through nipple IE3, chamber 55, passage 5i, ports ie, and through the walls of the elements I2I, thereby washing ofi the filter aid precoat and flushing it past the bafiie 21 into chamber 5 and out through conduit H5 and valve II! to a drain.

After backwashing the valve IIlfiis set to cut 01? the supply to both pipes I03 and I0!) and the filter must be recharged with filter aid in the manner described above. The cycle will thus be repeated.

Since the device is used on drinking water and other services in which the water supply is already reasonably clean, no harm is done to the elements by backwashing them with raw water.

Should the filter elements become plugged or punctured, it is a simple matter to replace them. The union III and a second union (not shown) in the line II5 are broken,-cap screws 31 are withdrawn, and the tank I is removed. Removal of the acorn nuts I43, washers I45 and retainers l3l permits the elements to be removed from the head. New elements are installed, and the filter is reassembled by performing the recited steps in the reverse order.

It is obvious that various changes may be made in the form, structure and arrangement of parts without departing from the spirit of the invention. Accordingly, applicant does not desire to be limited to the specific embodiment disclosed herein primarily for purposes of illustration; but instead, he desires protection falling fairly within the scope of the appended claim.

What I claim to be new and desire to protect by Letters Patent of the United States is:

In a filter, a case having an inlet and an outlet, filter elements in said case interposed between the inlet and the outlet in the path of liquid flowing therebetween, a number of projections disposed in circumferential spaced relation about said inlet and provided with radial openings and stop means below said openings, a baflie having a number of tabs projecting radially and downwardly from the periphery thereof and adapted to be positioned by said stop means to enter said openings, said. tabs being of such length as to engage in the openings when brought into a horizontal plane by being forced against said stop means so as to prevent removal of the baflie. said baflle being supported transversely across said inlet b3} the projections and tabs.

HARVEY E. MARVEL.

REFERENCES CITED The following references are of record in the file of 'this patent:

UNITED STATES PATENTS Number Abbott Mar. 19, 1907 Number 15 Number Name Date Kneuper Nov. 12, 1907 Kneuper Dec. 26, 1922 Kuhn et a1 Mar. 31, 1931 Stuart Feb. 19, 1935 Williams et a1. May 4, 1937 Arnold Apr. 9, 1940 Marvel Oct. 8, 1940 Reed Feb. 10, 1942 Clark Aug. 25, 1942 Malanowski Nov. 10, 1942 Russell Nov, 9, 1943 FOREIGN PATENTS Country Date Germany May 14, 1899 

